Safety drill and tap holder.



No. 862,901. PATENTED AUG. 13, 190v. E. GROOM.

SAFETY DRILL AND TAP HOLDER. APPLICATION IILED 00124:,1908.

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EDWARD GROOM, OF TARRYTOWN, NEW YORK.

SAFETY DRILL AND TAP HOLDER.

Specification of Letters Patent.

Patented Aug. 13, 1907.

Application filed October 24,1906. Serial Nb. 340,271.

To all whom it may concern:

Be it known that I, EDWARD GnooM, a citizen of the United States, and residing at Tarrytown, in the county of Westchester and State of New York, have invented certain new and useful Improvements in Safety Drill and Tap Holders, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to drill and tap holders, and the object thereof is to provide an improved device of this class which is simple in construction and operation and which is lighter and consists of less parts than other forms of devices of this class now in use, and which may also be operated with a minimum of power, which uses but one set-nut, which avoids the use of spanners, which can be oiled without being taken apart and which will last much longer than the drill and tap holders now in use.

The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which Figure l is a side View of my improved drill and tap holder; Fig. 2 a longitudinal section thereof on the line 22 of Fig. 3; Fig. 3 an end view looking in the direction of the arrow 90 of Fig. 2; and, Fig. 4 an end view opposite to that shown in Fig. 3.

In the practice of my invention I provide an outer body or shell portion a one end of which is reduced as shown at a and provided with wrench or spanner holes a one of which is shown in full lines in Fig. 1 and all in dotted lines in Fig. 3, and the shell or body portion a is bored longitudinally so as to form a cylindrical chamber a in the rear end thereof which is tapered to form a conical seat a in the front end thereof, and the outer portion of the cylindrical chamber a is threaded as shown at a.

Within the body or shell portion a is placed a coneshaped member I) having a tubular extension I) which projects through the front end of the body or shell portion a and into which, in practice, the drill or tap holder is inserted in the usual manner, said drill or tap holder being not shown, and which is provided near its opposite sides with longitudinal keys b and in the side thereof at right angles to the keys b are spring operated pins b which are adapted to move radially thereof, and in practice the drill or tap holder which is inserted into the tubular extension b of the conical member I) is provided with longitudinal grooves to receive the keys I) and an annular groove or grooves to receive the pins or plugs b and the inner end of the drill or tap holder is beveled so that when it is inserted into the tubular extension 1) it will force the pins or plugs b outwardly, and when fully inserted said pins or plugs are forced inwardly and enter the annular groove formed therein.

Placed adjacent to the conical member b is a washer c of hard fiber, and inserted into the chamber a is a'pin holder d consisting of a disk of metal of suitable thickness and in which are secured pins d which are arranged in a circle around the center thereof and four of which are preferably employed, and the shank e of the tool is provided with a circular, threaded head e which is bored parallel with the axis of said shank to form holes d designed to receive the pins d and that portion of the shank 12 adjacent to the head 0 is threaded and provided with a set or jam-nut f.

In assembling the parts of this tool the conical member 11 is inserted in the body or shell portion a as shown in Fig. 2. The washer c is then inserted, after which the pin holder d is inserted in the said body or shell portion. The shank e is then grasped in the hand and manipulated so that the pins d will enter the holes 6 and said shank is turned until the head 0 thereof is fully screwed into the body or shell portion a, after which the jam or set-nut f is screwed into position as shown in Fig. 2.

It will be understood that the object of the set or jamnut f is to force the pin holder d against the washer c which holds the conical member I) tightly seated, and the operation of this tool will be the same as that of other devices of this class.

The pin holder d is provided with a central opening d" and the washer c with a similar opening, and the head a of the shank e is provided in the face thereof adjacent to the pin holder d with a recess g, and communicating therewith is a port or passage 9 which opens through the head 6 of the shank 0 adjacent to said shank, and by means of this construction the interior of the device may be oiled or lubricated without disconnecting the parts.

My improved drill and tap holder maybe made much smaller and lighter than other devices of this class according to the work required, and is also composed of less parts and less liable to get out of order and is also much less expensive than the drill and tap holder now in use.

It will be apparent that the washer c is not an absolutely essential feature of my invention but I prefer to employ it for the reason that it reduces concussion and facilitates the operation of the device and the oiling thereof.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A drill and tap holder comprising a casing bored to form a cylindrical chamber having a conical seat at one end, a conical member inserted into said chamber and resting on said seat and provided with a tubular extension which projects from the casing, a pin holding disk inserted into said chamber and provided with pins which are arranged around the center thereof, a tool shank provided with a head adapted to be screwed into said casing and with holes adapted to receive said pins, and a set-nut mounted on the tool shank adjacent to the head thereof.

2. A tool of the class described, comprising a casing having a cylindrical chamber provided at one end with a conical seat, a conical member inserted into said casing and bearing on said seat and provided with an extension which projects at one end of said casing, a pin holder inserted into said cylindrical chamber, a tool shank pro vided with a head adapted to be screwed into said casing and to press on the pin holder, and provided with pin holes and pins connected with said pin holder and adapted to pass through the head'of the tool shank, and means connected with the tool shank for exerting pressure on said pins.

In testimony that I claim the foregoing as my invention I have signed my name in presence of the subscribing witnesses this 19 day of October 1906.

EDWARD GROOM.

Witnesses SQUIRE NOLES, GUSTAV WALLBILLICH. 

